I was trying to pick up Clojure again, but am stumbling right at the beginning. I downloaded lein, and copied the following project.clj and a hello.clj to be absolutely sure that I have a minimal working example.
project.clj:
(defproject hello "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.7.0"]]
:uberjar {:aot :all}
:main hello.core
)
hello.clj:
(ns hello.core
(:gen-class)
)
(defn -main
"This should be pretty simple."
[]
(println "Hello, World!"))
When I run './lein uberjar' I get these warnings:
Warning: specified :main without including it in :aot.
Implicit AOT of :main will be removed in Leiningen 3.0.0.
If you only need AOT for your uberjar, consider adding :aot :all into your
:uberjar profile instead.
Warning: The Main-Class specified does not exist within the jar. It may not be executable as expected. A gen-class directive may be missing in the namespace which contains the main method.
Created .../target/hello-0.1.0-SNAPSHOT.jar
Created .../target/hello-0.1.0-SNAPSHOT-standalone.jar
Trying to run this either with ./lein run or with java -jar ./target/hello-0.1.0-SNAPSHOT-standalone.jar results in exceptions:
Can't find 'hello.core' as .class or .clj for lein run: please check the spelling.
Exception in thread "main" java.io.FileNotFoundException: Could not locate hello/core__init.class or hello/core.clj on classpath., compiling:(/private/var/folders/28/bk6d4xj123b0xvsvk91_1jg80009rn/T/form-init1007755193774766954.clj:1:125)
So what is my problem here?
:uberjar {:aot :all} -> :profiles {:uberjar {:aot :all}}
And move hello.clj into ./src/hello directory and rename it to core.clj
Related
Despite adding the desired dependency to my project.clj file,
(defproject word-tree "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.10.1"]
[org.clojure/clojurescript "1.10.520"]
[clojure-opennlp "0.5.0"] ; <----------------------here
[reagent "0.8.1"]]
...
I am unable to access the functions that the dependency provides.
After referencing the namespace in one of my files,
(ns word-tree.suffix-tree
(:require [clojure.string :as str]
[opennlp.nlp :as nlp])) ; <-----this is the namespace of the dependency
I get this error:
No such namespace: opennlp.nlp, could not locate opennlp/nlp.cljs, opennlp/nlp.cljc, or JavaScript source providing "opennlp.nlp"
The weirdest part is that when I run lein deps :tree the dependency shows up!
$ lein deps :tree
...
[cider/piggieback "0.4.1" :scope "test"]
[cljfmt "0.5.7"]
[rewrite-clj "0.5.2"]
[rewrite-cljs "0.4.3"]
[clojure-complete "0.2.5" :exclusions [[org.clojure/clojure]]]
[clojure-opennlp "0.5.0"] <------------------------------------------------here!!!
[instaparse "1.4.9"]
[org.apache.opennlp/opennlp-tools "1.9.0"]
[figwheel-sidecar "0.5.19" :scope "test"]
...
For my project I really want to use this dependency but it's not working. Any advice would be most welcome. Thanks.
It seems to me the problem is that the library is for Clojure on the JVM only, and you are trying to use it on a ClojureScript project.
No such namespace: opennlp.nlp, could not locate opennlp/nlp.cljs, opennlp/nlp.cljc, or JavaScript source providing "opennlp.nlp"
The compiler tried to look for ClojureScript code (extension .cljs) or compatible with both Clojure and ClojureScript (extension .cljc) or plain JavaScript, but found none.
I'm trying to set up a development version and a production version of my application using leiningen via the project.clj.
How can I have both? Because I have to comment out the :main part of my project.clj in order to get access to the development version when I use lein repl.
So I am using stuartsierra/reloaded leiningen template which has a nice development environment.
It comes with no :main key and when I added one that's when I stopped getting the development version of my project.
Instead of seeing
user=>
When I type lein repl I end up seeing my main, which is in the jaribu namespace
io.wakamau.jaribu=> ;; my main
The solution that seems to work is to comment out the :main part of the project.clj.
(defproject io.wakamau/jaribu "0.1.0-SNAPSHOT"
:description "trying out pedestal and component"
:url "https://github.com/kevinmungai/jaribu"
:license {:name "TODO: Choose a license"
:url "http://choosealicense.com/"}
:dependencies [[org.clojure/clojure "1.10.0"]
[com.stuartsierra/component "0.3.2"]]
:profiles {:dev
{:dependencies [[org.clojure/tools.namespace 0.2.11"]
[com.stuartsierra/component.repl "0.2.0"]]
:source-paths ["dev"]}
:uberjar {:aot [io.wakamau.jaribu]}}
:main ^{:skip-aot true} io.wakamau.jaribu
:min-lein-version "2.0.0")
trying out
lein repl
results in:
io.wakamau.jaribu=>
when the :main is commented out:
(defproject io.wakamau/jaribu "0.1.0-SNAPSHOT"
...
;; :main ^{:skip-aot true} io.wakamau.jaribu
:min-lein-version "2.0.0")
the result is:
user=>
I have to admit that I don't know much about using leiningen.
You can specify :repl-options {:init-ns io.wakamau.jaribu=>} in project.clj. You can also specify constants for different environments in profiles.clj, e.g., :dev {:main io.wakamau.jaribu}. Also see How do I start the REPL in a user defined namespace?.
I've gotten leiningen to find a library I have in a corporate Artifactory repository, and it seems to download it just fine, but when I open try to require it, running the code with lein run comes back with a FileNotFoundException.
My project file looks like this:
(defproject clj-test "0.1.0-SNAPSHOT"
:description "FIXME: write description"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.8.0"]
[com.ourgroup/library "1.0.0"]]
:repositories [["releases" {:url "https://url-to-our-repo"
:username "username"
:password "password"}]]
:main ^:skip-aot clj-test.core
:target-path "target/%s"
:profiles {:uberjar {:aot :all}})
My single code file looks like this:
(ns clj-test.core
(:gen-class)
(:require [library :as lib]))
(defn -main
"I don't do a whole lot ... yet."
[& args]
(println "And now for something completely different..."))
You need to import a class. To get the name of the class take a look inside the jar (or at the Java source code) and find the Java package and class that make up the fully qualified class name that you need to import.
I've edited this. My earlier mistake has been corrected with the comment: "You require namespaces; you import classes. Requiring a class is no good". So for Java interop you need to import classes, the same as you would be doing if you were writing a Java source file.
I'm trying to make a stand alone jar from my bare-bones Clojure project using the Leiningen plugin in Intellij's Cursive.
To create the project, I just created the project.clj file, opened it, and Cursive offered to import it as a project.
project.clj:
(defproject WaterTimer "1"
:description "A timer that reminds you to drink water"
:main tone-producer/main)
tone-producer.clj:
(ns tone-producer
(:require [general-helpers :as g])
(:import [javax.sound.midi MidiSystem
Synthesizer
MidiChannel])
(:gen-class))
(defn main [& args]
(println "Test!"))
When I run the "uberjar" task, I get the following output:
Warning: specified :main without including it in :aot.
Implicit AOT of :main will be removed in Leiningen 3.0.0.
If you only need AOT for your uberjar, consider adding :aot :all into your
:uberjar profile instead.
Warning: The Main-Class specified does not exist within the jar. It may not be executable as expected. A gen-class directive may be missing in the namespace which contains the main method.
Created C:\Users\slomi\IdeaProjects\WaterTimer\target\WaterTimer-1.jar
Created C:\Users\slomi\IdeaProjects\WaterTimer\target\WaterTimer-1-standalone.jar
I also tried changing the main function to have the default name, and omit the name from the defproject:
(defproject WaterTimer "1"
:description "A timer that reminds you to drink water"
:main tone-producer)
(ns tone-producer
(:require [general-helpers :as g])
(:import [javax.sound.midi MidiSystem
Synthesizer
MidiChannel])
(:gen-class))
(defn -main [& args]
(println "Test!"))
But now I get the error:
Error: Could not find or load main class clojure.main
Compilation failed: Subprocess failed
The structure is:
WaterTimer
src
tone-producer.clj
project.clj
target
Any guidance here would be appreciated.
After a bit of fiddling
I dropped (:require [general-helpers :as g]) since its not necessary to demostrate the issue
Error: Could not find or load main class clojure.main Compilation failed
you didn't include the clojure dependency [1]
:gen-class needs AOT - as Sanchayan pointed out
see [2]
project.clj
(defproject WaterTimer "0.0.1"
:description "A timer that reminds you to drink water"
:dependencies [[org.clojure/clojure "1.8.0"]] ;; <- [1]
:main tone-producer
:aot [tone-producer]) ;; <- [2]
src/tone_producer.clj - USE '_' instead of '-' in the filename
(ns tone-producer
(:import [javax.sound.midi MidiSystem
Synthesizer
MidiChannel])
(:gen-class))
(defn -main [& args]
(println "Test!"))
Result:
$ lein uberjar
Compiling tone-producer
Compiling tone-producer
Created .../watertimer/target/WaterTimer-0.0.1.jar
Created .../watertimer/target/WaterTimer-0.0.1-standalone.jar
$ java -jar target/WaterTimer-0.0.1-standalone.jar
Test!
Generally I'd recommend to init a project with lein new <name> via command line and the import it into Cursive/Other IDE of choice.
For creating uberjars, the project file should have the :aot keyword enabling ahead of time compilation.
Here is an output from my project.clj file.
(defproject jdbc "0.1.0-SNAPSHOT"
:description "JDBC Project"
:url "http://example.com/FIXME"
:license {:name "Eclipse Public License"
:url "http://www.eclipse.org/legal/epl-v10.html"}
:dependencies [[org.clojure/clojure "1.8.0"]
[org.clojure/java.jdbc "0.6.1"]
[postgresql "9.3-1102.jdbc41"]
[com.mchange/c3p0 "0.9.5.2"]
[byte-streams "0.2.2"]]
:main jdbc.core
:aot [jdbc.core])
Note the :main and :aot entries. Also it needs to be -main as already stated by birdspider.
using lein for clojure, attempting to use the clojurescript plugin.
followed all readme.md install steps, project.clj has
:dependencies [[org.clojure/clojure "1.7.0"]
[org.clojure/clojurescript "0.0-3126"]]
;; lein-cljsbuild plugin to build a CLJS project
:plugins [[lein-cljsbuild "1.0.6"]]
:hooks [leiningen.cljsbuild]
I cannot seem to get lein to recognize the plugin and am not sure what is being the gremlin.
C:\Functional_Languages\Clojure\clojurescript_master\!work\modern-cljs>lein cljsbuild once
'cljsbuild' is not a task. See 'lein help'.
C:\Functional_Languages\Clojure\clojurescript_master\!work\modern-cljs>lein compile
C:\Functional_Languages\Clojure\clojurescript_master\!work\modern-cljs>lein cljsbuild once
'cljsbuild' is not a task. See 'lein help'.
C:\Functional_Languages\Clojure\clojurescript_master\!work\modern-cljs>lein -v
Leiningen 2.5.1 on Java 1.8.0_51 Java HotSpot(TM) 64-Bit Server VM
C:\Functional_Languages\Clojure\clojurescript_master\!work\modern-cljs>
If you use lein new mies ... for getting the project file, and execute the command, the automatically generated project.clj file should be modified.
This is an example that shows the change:
Before:
(defproject simple "0.1.0-SNAPSHOT"
:description "FIXME: write this!"
:url "http://example.com/FIXME"
:dependencies [[org.clojure/clojure "1.7.0"]
[org.clojure/clojurescript "1.7.122" :classifier "aot"
:exclusion [org.clojure/data.json]]
[org.clojure/data.json "0.2.6" :classifier "aot"]]
:jvm-opts ^:replace ["-Xmx1g" "-server"]
:plugins [[lein-npm "0.6.1"]]
:npm {:dependencies [[source-map-support "0.3.2"]]}
:source-paths ["src" "target/classes"]
:clean-targets ["out" "release"]
:target-path "target")
After
(defproject simple "0.1.0-SNAPSHOT"
:description "FIXME: write this!"
:url "http://example.com/FIXME"
:dependencies [[org.clojure/clojure "1.7.0"]
[org.clojure/clojurescript "1.7.122" :classifier "aot"
:exclusion [org.clojure/data.json]]
[org.clojure/data.json "0.2.6" :classifier "aot"]]
:node-dependencies [[source-map-support "0.2.8"]]
:jvm-opts ^:replace ["-Xmx1g" "-server"]
:plugins [[lein-npm "0.6.1"]
[lein-cljsbuild "1.0.4"]]
:npm {:dependencies [[source-map-support "0.3.2"]]}
:source-paths ["src" "target/classes"]
:clean-targets ["out" "release"]
:target-path "target"
:cljsbuild {
:builds [{:id "simple"
:source-paths ["src"]
:compiler {
:main simple.core
:output-to "out/simple.js"
:output-dir "out"
:optimizations :none
:target :nodejs
:cache-analysis true
:source-map true}}]})
As you see, you need to add lein-cljsbuild plugins with build information. For further explanation, refer to http://www.mase.io/code/clojure/node/2015/01/24/getting-started-with-clojurecript-and-node/
If you don't want the change, just run ./scripts/build.
I think the problem is that your project.clj file is lacking a :cljsbuild stanza/key which defines the various parameters required to compile the clojurescript source files.
Have a look at Modern Clojurescript Tutorial for more details or you can check out my clojurescript file upload example to get an idea of how you can define :cljsbuild targets.